| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.directory.server.core.partition.impl.btree.jdbm; |
| |
| |
| import java.io.IOException; |
| |
| import javax.naming.NamingException; |
| |
| import org.apache.directory.server.core.partition.impl.btree.Tuple; |
| import org.apache.directory.server.core.partition.impl.btree.TupleBrowser; |
| |
| |
| /** |
| * TupleBrowser wrapper for Jdbm based TupleBrowsers. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| * @version $Rev$ |
| */ |
| public class JdbmTupleBrowser implements TupleBrowser |
| { |
| /** underlying wrapped jdbm.helper.TupleBrowser */ |
| private jdbm.helper.TupleBrowser jdbmBrowser; |
| /** safe temp jdbm.helper.Tuple used to store next/previous tuples */ |
| private jdbm.helper.Tuple jdbmTuple = new jdbm.helper.Tuple(); |
| |
| |
| /** |
| * Creates a JdbmTupleBrowser. |
| * |
| * @param jdbmBrowser JDBM browser to wrap. |
| */ |
| public JdbmTupleBrowser(jdbm.helper.TupleBrowser jdbmBrowser) |
| { |
| this.jdbmBrowser = jdbmBrowser; |
| } |
| |
| |
| /** |
| * @see TupleBrowser#getNext(org.apache.directory.server.core.partition.impl.btree.Tuple) |
| */ |
| public boolean getNext( Tuple tuple ) throws NamingException |
| { |
| boolean isSuccess = false; |
| |
| synchronized ( jdbmTuple ) |
| { |
| try |
| { |
| isSuccess = jdbmBrowser.getNext( jdbmTuple ); |
| } |
| catch ( IOException ioe ) |
| { |
| NamingException ne = new NamingException( "Failed on call to jdbm TupleBrowser.getNext()" ); |
| ne.setRootCause( ioe ); |
| throw ne; |
| } |
| |
| if ( isSuccess ) |
| { |
| tuple.setKey( jdbmTuple.getKey() ); |
| tuple.setValue( jdbmTuple.getValue() ); |
| } |
| } |
| |
| return isSuccess; |
| } |
| |
| |
| /** |
| * @see TupleBrowser#getPrevious(Tuple) |
| */ |
| public boolean getPrevious( Tuple tuple ) throws NamingException |
| { |
| boolean isSuccess = false; |
| |
| synchronized ( jdbmTuple ) |
| { |
| try |
| { |
| isSuccess = jdbmBrowser.getPrevious( jdbmTuple ); |
| } |
| catch ( IOException ioe ) |
| { |
| NamingException ne = new NamingException( "Failed on call to jdbm TupleBrowser.getPrevious()" ); |
| ne.setRootCause( ioe ); |
| throw ne; |
| } |
| |
| if ( isSuccess ) |
| { |
| tuple.setKey( jdbmTuple.getKey() ); |
| tuple.setValue( jdbmTuple.getValue() ); |
| } |
| } |
| |
| return isSuccess; |
| } |
| } |